BO3Y
Morgan, P.E.D.Carroll, P.J.Lange, F.F.
Materials Research Bulletin (1977) 12, 251-260
a=6.544Å b=6.544Å c=8.81Å
α=90° β=90° γ=120°
NO2SiY
a=7.021Å b=7.021Å c=9.1Å